72=4n+9-n-3

Solution for 72=4n+9-n-3 equation:

Simplifying
72 = 4n + 9 + -1n + -3

Reorder the terms:
72 = 9 + -3 + 4n + -1n

Combine like terms: 9 + -3 = 6
72 = 6 + 4n + -1n

Combine like terms: 4n + -1n = 3n
72 = 6 + 3n

Solving
72 = 6 + 3n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-3n' to each side of the equation.
72 + -3n = 6 + 3n + -3n

Combine like terms: 3n + -3n = 0
72 + -3n = 6 + 0
72 + -3n = 6

Add '-72' to each side of the equation.
72 + -72 + -3n = 6 + -72

Combine like terms: 72 + -72 = 0
0 + -3n = 6 + -72
-3n = 6 + -72

Combine like terms: 6 + -72 = -66
-3n = -66

Divide each side by '-3'.
n = 22

Simplifying
n = 22